After teaching C2 Techniques and how games work, with various samples, I observed a whole student class change from singular visitors to real developers.
Become an one man army is a matter of how you do things, and becoming organized, paying attention to details, etc, you can make almost anything, even with trial & error.
My next game will be an adventure, and the second in the line will be another adventure, with some unique techniques, the third will be an action adventure. Actually I'm learning how to draw manga and HQs (Comics) to draw it.
The course of HQ and Manga are running in parallel with my Dr. Degree in Civil Engineer (Calculist), so, you can see how the time is a matter of desire and not only opportunity.
If you lack skills in art, find someone to fill this hole or start learning / improving it, otherwise you'll waste your time, instead of making something good with your precious time.